Skin-infiltrating monocytes/macrophages migrate to draining lymph nodes and produce IL-10 after contact sensitizer exposure to UV-irradiated skin

Eiko Toichi, Kurt Q. Lu, Alan R. Swick, Thomas S. McCormick, Kevin D. Cooper

Research output: Contribution to journalArticlepeer-review

33 Scopus citations

Abstract

Low-dose UVB exposure induces antigen-specific unresponsiveness to antigen(s) introduced through UV-irradiated skin (tolerance). Analysis of cytokine expression in murine draining lymph nodes (DLNs) revealed that IL-12p40 mRNA and protein expression as well as IL-12p70 protein were upregulated after application of the contact sensitizer 2,4 dinitro-1-fluorobenzene (DNFB) to normal skin. The cellular source of IL-12p40 mRNA was CD11c+ cells. By contrast, following DNFB application to UV-irradiated skin (UV+DNFB), IL-12p40 mRNA was not upregulated, and DLN IL-12p40 and p70 proteins were reduced. UVB irradiation alone did not upregulate IL-10 mRNA, but UV+DNFB upregulated IL-10 mRNA as early as 3-6 hours after DNFB application, immediately preceding a decrease of IL-12p40 mRNA from the level induced by UVB. The infiltration of F4/80+ cells into UV-irradiated skin was followed by a rapid and remarkable increase of F4/80+CD11c- cells in DLN 3 hours following DNFB application. FITC/DNFB skin painting and subsequent enzyme-linked immunospot assay demonstrated that flow-sorted FITC +F4/80+CD11c- cells from the DLN produce IL-10. Thus, monocytes/macrophages that infiltrated into the skin following UVB exposure migrate to the DLN triggered by contact sensitizers. Production of IL-10 by migrating macrophages, in conjunction with IL-12 inhibition in the DLN, likely reflects a role as mobile suppressive mediators for locally induced UV tolerance.

Original languageEnglish (US)
Pages (from-to)2705-2715
Number of pages11
JournalJournal of Investigative Dermatology
Volume128
Issue number11
DOIs
StatePublished - Nov 2008

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Dermatology
  • Cell Biology

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